package com.itheima.feilter;

import com.alibaba.fastjson.JSON;
import com.itheima.common.BaseContext;
import com.itheima.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(filterName = "longincheckfilter", urlPatterns = "/*")
@Slf4j
public class LoginCheakFeilter implements Filter {

    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse resp = (HttpServletResponse) servletResponse;

        String requestURI = request.getRequestURI();

        log.info("拦截到的请求: {}", requestURI);

        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/login",
                "/user/loginout",
                "/user/sendMsg"
        };

        boolean check = check(urls, requestURI);

        if (check) {
            log.info("本次请求{}不需要处理", requestURI);
            filterChain.doFilter(request, resp);
            return;
        }

        if (request.getSession().getAttribute("empl") != null) {
            log.info("用户已登录id为{}", request.getSession().getAttribute("empl"));

            //获取id存到当前线程中
            Long emplId = (Long) request.getSession().getAttribute("empl");
            BaseContext.setThreadLocal(emplId);

            filterChain.doFilter(request, resp);
            return;
        }
        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已登录id为{}", request.getSession().getAttribute("user"));

            //获取id存到当前线程中
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setThreadLocal(userId);

            filterChain.doFilter(request, resp);
            return;
        }
        log.info("用户未登录!");
        resp.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
    }


    public boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }
}
